DO NOT MERGE:CDD annotations for Section 7.4.1

CDD SECTION: 7.4.1/C-1-1: MUST declare the android.hardware.telephony feature flag
and other sub-feature flags --> SystemFeaturesTest#testTelephonyFeatures()

CDD SECTION: 7.4.1/C-1-2: Must implement full support for the API for that tech
Annotated this requirement to al telephony tests.

CDD SECTION:3.2.3.5/C-2-3--> Annotated EnablePhoneAccountTestActivity

Test: make cts

CDD VERSION: 8.1 https://source.android.com/compatibility/8.1/android-8.1-cdd

Bug: 112612833

Change-Id: I973b1baf0ad8365dd9ae152cc6575a4fed5ad804